The clutch on my '95 4 cyl S-10 sticks when it gets warm and after repeated shifts. The problem gets worse the warmer the engine temperature gets. When I run the A/C I can count on having the clutch stick in the engaged position regularly (the pedal comes up, but clutch stays engaged). Had clutch, throw-out bearing, etc., replaced and made no difference. Also there's a distinct squeaking noise from the clutch pedal. Any ideas?